egregious
adj.adj. extremely bad and easy to notice. You use this to describe a mistake or a behavior that is much worse than usual.
adj. outstandingly bad or shocking; remarkably flagrant. Often used to qualify nouns representing errors, violations, or lapses in judgment.
The report contains several egregious errors.
The company faced heavy fines after the court found evidence of egregious safety violations at the factory.
While minor administrative oversights are common, the systematic falsification of data represents an egregious breach of scientific ethics that cannot be overlooked by the committee.
From Latin ēgregius, from e- (“out of”), + grex (“flock”), + English adjective suffix -ous, from Latin suffix -osus (“full of”); reflecting the positive connotations of "standing out from the flock".
Typically used attributively before a noun; often modified by 'particularly' or 'truly'.